[GFS2] Don't mark jdata dirty in gfs2_unstuffer_page()

Journaled data is marked dirty by gfs2_unpin and should not be marked
dirty here.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/bmap.c

@@ -95,7 +95,8 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 	set_buffer_uptodate(bh);
 	if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
 		gfs2_trans_add_bh(ip->i_gl, bh, 0);
-	mark_buffer_dirty(bh);
+	if (!gfs2_is_jdata(ip))
+		mark_buffer_dirty(bh);
 
 	if (release) {
 		unlock_page(page);